Snow thrower



FIG. 1 is an enlarged perspective view of a snow thrower embodying our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof, the right side being a mirror image thereof; and

FIG. 4 is a rear elevational view thereof. 

The ornamental design for a snow thrower, as shown and described. 